ART. 26 WASPS OF SUBFAMILY PSENINAE MALLOCH 13 



scape markedly swollen ; the mid tarsus is modified, the basal segment 

 having 2 spines on one side and most of the others having some mi- 

 nute black bristles on one side. The abdominal petiole in both sexes is 

 flattened above much as in nnonticola Packard, the wing venation 

 is also as in that species, and the pygidium of the female is rather 

 dull, owing to the presence of microscopic shagreening on its entire 

 surface, while there are rather large piliferous punctures almost 

 evenly distributed over it. The male of the genotype has the fine 

 erect hairs at the apices of third and fourth abdominal sternites 

 more or less matted centrally and forming fasciculae. The antennae 

 and mid tarsi of the males of the North American species are not 

 abnormal in form, nor are they in the females of any of the in- 

 cluded species, so that we disregard these as subgeneric characters. 

 The hind coxae lack the sharp carina on inner side so characteristic 

 of Pseneo. This was called " Group inonticola " by Fox. He had 

 but one species. 



Below is presented a key to the North American species available 

 to the author. 



KEY TO THE SPECIES OF SUBGENUS P8EN 



1. Males 2 



Females 5 



2. Only 'fourth abdouiiual sternite with fasciculate soft hairs, which are con- 



fined to middle of apex and are very short, or the third also with a very 

 short narrow tuft of such hairs on central line at apex; petiole of abdo- 

 men evenly rounded above, witliout angular lateral edges ; entire abdomen 



shining black 3 



Third and fourth abdominal sternites each with prominent fasciculate hairs 

 at apices, which extend almost across ventral exposure of apices ; petiole 

 flattened above, lateral edges quite sharp; abdomen partly red 4 



3. Petiole of abdomen slightly angulate along sides, but without a distinct 



lateroventral carina ; mesopleura with large, deep, almost contiguous 



punctures on most of its surface unifasciculatus, new species 



Petiole of abdomen with a distinct raised marginal line or carina on each 

 lateral edge of its ventral surface ; mesopleura with quite small, shallow, 

 isolated punctures on most of its surface myersiana (Rohwer) 



4. Petiole of abdomen red, remainder of abdomen black ; antennal flagellum 



simple ; mesonotum except the anterior lateral portions coarsely striato- 

 punctate ; second recurrent nervure generally entering second submarginal 



cell close to its apex erythropoda Rohwer 



Petiole black, remainder of abdomen red ; flagellar segments 3 to 10 each 

 with an elongate swelling or carina along one side ; second recurrent 

 nervure generally entering third submarginal cell a little lieyoud its base 

 (pi. 1, fig. 5) monticola (Packard) 



5. Abdomen, femora, and tibiae black ; clypeus ^-ith two short rounded teeth 



at apex, which are rather close together ; petiole evenly rounded above ; 

 pygidial area narrow, almost glossy, the shagreening noticeable only at 

 apex, and with a series of fine hairs along sides myersiana (Rohwer) 



